Internal grinder.



A. SCHACHAT.

v vINTERNAL GRINDER.v APPLICATION FILED ume. 1917.

Patented Dec. 11, 191?;

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INTERNAL GRINDER APPLICATION FILED FEB. 15, 19171 1,256 10? Patent d, m. 11, 1917.

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ABRAHAM SCHACHAT, or BROOKLYN, NEW YORK, ASSIGNOR To sLocuM, AVRAM &

SLOCUM, INC., 01? NEW YORK, N. Y., A CORPORATION OF NEW YORK.

INTERNAL GRINDER.

Specification of Letters Patent.

Application filed February 16, 1917. Serial No. 149,038.

Internal Grinders; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to internal grinders, adapted more particularly for use in connection with bench-lathes, and has for its objects, first, to provide an improved bearing for the shaft of the grinding-tool; secondly, so to construct the device that the shaft and its bearings may be swung away fromtheir operative position, whereby the work may be inspected without disturbing the adjustment and thirdly, to provide a vernier reading whereby the adjustment of the tool in a horizontal plane may be determined with great accuracy.

These objects I accomplish in the manner and by the means hereinafter described and claimed, reference being had to the accompanying drawings, in which Figure 1 is a horizontal sectional view of my improved machine, taken through the center of the bearings for the shaft;

Fig. 2 is a side elevation of the machine; and

' Fig. 3 is a vertical transverse sectional view taken on the line IIIIII, Fig. 1, showing the same applied to a bench-lathe, the latter also being shown in section.

Similar numerals of reference denote corresponding parts in the several views.

In the said drawings, the reference numeral 1 denotes the base of the machine, the same being adapted to rest upon the upper surface of a lathe cross-slide 2, and being provided with the usual headed bolt 3, which engages in the tool-post slot of the crossslide, whereby the two are connected. It will be observed, with reference, more particularly to Fig. 3, that the bolt 3 is mounted to beadjusted vertically by an eccentric ered to clamp or unclamp it with respect to the cross-slide 2, in a manner readily understood. The upper face of the base 1 is provided with a central circularly'raised. port1on 6 grooved in its outer face at 7 and over which fits a top-plate 8, the latter being circular in contour to conform to the base 1, as shown. Passing through the side of the top-plate 8, and in screw-threaded engagement therewith, is a screw 9, provided with a handle 10, adapted to engage the groove 7 Patented Dec. 11, 1917.

in the base 1, not only to retain the two against separation, but also, when screwed tightly to position, to retain the top-plate against rotation on the base 1. Mounted in a pair of upstanding lugs 11 on the topplate 8 is a horizontal shaft 12 which retains between the lugs 11, the extension 13 of a bracket 14, the latter being extended angularly and horizontally at 15'to provide separated supports for the bearings about to .be described. Each of said extensions 15 termlnates in a collar 16 adapted tofreceive therein an outer bushing 17 coned on its inner face, which is adapted to fit over a similarly coned inner bushing 18, the latter internal grinding-wheel 24, and at its center has fixed thereto a drive-wheel or pulley 25. It will be understood that said spindle. is capable of longitudinal movement in its bearings, but that the inner bushings 18 necessarily will revolve therewith, due to the engagement of the screw 20 with thegroove 21 in said spindle, the two forming a splined engagement. The bushings 17 and 18 and their parts are protected suitably by 'removable dust-caps 26. 1 I .7

The bracket ltcarrying the spindle 22 and its parts is capable of being rotated on the shaft 12, from. a horizontalto any" ad.

justed position, and its movement toward the top-plate 8 Whenapproaching the grinding position of the spindle may be regulated by the set-screws 27 in a well-known manner. And said bracket will be retained in its operative position by means of a bolt 28 v pivoted at 29 to the top-plate 8 and adapted to be swung into a groove 30 in the extension 13 where it may be clamped by means of --a clamping-nut 31, in a manner readily understood. The extensions 15 of the bracket 1 are provided with oil-ducts or grooves 31 normally closed by dust-caps 32, said grooves leading to the bushings 18, and through which oil passes by apertures 33 to provide the necessary lubricant. The base 1 is provided on its outer surface with a vernier reading 34, best seen in Fig. 2, which, in connection with an indicating mark 35 on the top-plate 8, provides a means for determining the accurate adjustment of said top-plateQ In operation, the base 1 is adjusted upon the tool-lathe so that the T-head of thebolt 3 is disposed in the tool-post slot of the cross slide 2, and is clamped in position by rotating the cam-shaft 4. i The top-plate 3 then can be adjusted circularly by loosening the screw9 and rotating said topplate upon the base 1, the Vernier scale 34 and its indicating mark 35afiording means for effecting a most accurate adjustment, which when attained may be maintained by locking the two parts to-getherthrough said screw 9. The spindle 22 carrying the grinding-wheel 2i then may be adjusted vertically to the exact position desired by means of the set-screws 27 in a manner readily understood, and the parts may be locked in this position by engaging the bolt 28 in the groove 30 of extension 13 and clamping the same in position by means of the nut 31. The tool is ready for operation, and the spindle 22, which is driven in the usual manner through power applied to the wheel or pulley 25, may be shifted longitudinally by means of the handle 23, and while being rotated will be rotated with it the inner coned bushings 18, which are splined thereto, and which rotate within the outer bushings 17 carried by the sleeves 16. hen it is desired to inspect the work, the spindle 22 and itsgrin-ding wheel 2% may be withdrawn longitudinally from operative position, and said spindle and its carrying bracket .13 may be rotated on the shaft 12 completely out of the way so as to permit an inspection of the work, as well as a ready gaging of the same. It will be appreciated that this movement of the grinding-wheel and its spindle away from the work will in no way aifect the adjustment of the tool, as it may be returned most accurately to its exact initial position.

Having thus described my invention, what I claim as new and desire to secure by Let ters Patent is 1. In a grinding machine, an inclosing collar, a grindingwheel carryingspindle therein, an inner coned bushing splined to said spindle, an outer coned bushing fitting over said inner bushing and within said inclosingcollar, and a. lock nut threaded onto the small end of the inner coned bushing to lock the two bushings together.

2-. In a grinding machine, a base adapted to be clamped to a lathe, and a tool-spindle supported by said base and mounted so as to be shifted on an axis parallel with its length bodily to and from its line of operation without disturbing the adjustment of the same, said spindle also being shiftable in its bearings on its axial line.

3. In agr'indin-g machine, a base adapted to be clamped to a lathe, and a tool-spindle mounted on horizontal pivots on said base whereby it may be shifted on an axis parallel with its length bodily to and from its lines of operation without disturbing the adjustment of the same, said spindle also being shiftable in its bearings 011 its axial lines.

4. In a grinding machine, a base adapted to be clamped to a lathe, a top-plate pivoted on said base, and a tool-spindle mounted on horizontal pivots on said top-plate insuch a manner as to'be capable of being shifted on an axis parallel with its length bodily to and from its line of operation without disturbing the adjustment of the same, said spindle also being shiftable in its bearings on its axial line.

5. In a grinding machine, a base adapted to be clamped to a lathe and having a cen tral circular raised portion, said raised portion being grooved annually in its esicle face, a top-plate recessed to fit over said raised portion, a tool-spindle carried by said top plate, and a screw passing through said top plate and adapted to engage the groove in said raised-portion to lock said'base and top plate in any adjusted position.

6. In a grinding machine, a base adapted to be clamped to a lathe, a bracket supported on a horizontal pivot on said base, a toolcarrying-spindle carried by said bracket, adjustable means for limiting the movement of said bracket with respect to said base, and means for looking said bracket when adjusted with respect to said base.

7. In a grinding machine, a base adapted to be clamped to a lathe, a top-plate mounted to be rotated upon said base, a bracket supported upon a horizontal pivot on said top-p'late, a tool-earrying-spindle carried by said bracket, adjustable means for limiting the movement said bracket with respect to said top-plate, and means for locking said bracket when adjusted with respect to said top-plate.

8. In a grinding machine, a base adapted screw on said top-plate adapted to be swung to be clamped to a lathe, a t0pp1ate inountinto a slot in said bracket, and a nut for 10 ed to be rotated upon said base, a bracket clamping said screw to lock said bracket to mounted on a horizontal pivot on said top said top-plate.

5 plate, a tool-carrying-spindle carried by said In testimony whereof, I have hereunto set top-plate, set-screws in said bracket adapted my hand this 14th day of February, 1917. to regulate the distance between the free end of said bracket and said top-plate, a pivoted ABRAHAM SCHACHAT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

